2 sentences

1. 他竟然相信这种骗局，简直是个低能儿。

   tā jìng​rán xiāng​xìn zhè zhǒng piàn​jú, jiǎn​zhí shì gè dī​néng'ér.

   He actually fell for that scam; he's a complete idiot.

   Source: Dong Chinese Dictionary

2. 照顾低能儿需要家长付出更多的耐心和爱心。

   zhào​gu dī​néng'ér xū​yào jiā​zhǎng fù​chū gèng duō de nài​xīn hé ài​xīn.

   Caring for children with intellectual disabilities requires extra patience and love from parents.

   Source: Dong Chinese Dictionary